Talk:Isotopes of neodymium

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Problem

Hi everyone!

Look, 27.2% (¹⁴²Nd) + 12.2% (¹⁴³Nd) + 23.8% (¹⁴⁴Nd) + 8.3% (¹⁴⁵Nd) + 17.2% (¹⁴⁶Nd) + 5.8% (¹⁴⁸Nd) + 5.6% (¹⁵⁰Nd) =100.10% (but not exactly 100%)

In your case the Standard atomic weight will be 144.384!

Please find and correct mistake!-Surprizi (talk) 11:34, 5 September 2021 (UTC)[reply]

I checked and only from ¹⁴²Nd we can take out 0.10% to receive Standard atomic weight — 144.242. So in my opinion ¹⁴²Nd percentage should be 27.1% not 27.2%.-Surprizi (talk) 11:51, 5 September 2021 (UTC)[reply]

Probably there's a rounding error in the table or the source. I will take a look later. ComplexRational (talk) 14:49, 5 September 2021 (UTC)[reply]

¹⁴²Nd	60	82	141.9077233	27.1%	38.45699301
¹⁴³Nd	60	83	142.9098143	12.2%	17.43499734
¹⁴⁴Nd	60	84	143.9100873	23.8%	34.25060078
¹⁴⁵Nd	60	85	144.9125736	8.3%	12.02774361
¹⁴⁶Nd	60	86	145.9131169	17.2%	25.09705611
¹⁴⁸Nd	60	88	147.9168930	5.8%	8.579179794
¹⁵⁰Nd	60	90	149.9208910	5.6%	8.395569896
A_{r, stand.}(Nd)				100%	144.242141

This is my calculations with corrections from 27.2% to 27.1%.-Surprizi (talk) 18:43, 5 September 2021 (UTC)[reply]

Standard atomic weight is given in {{CIAAW2017}}^[1]. In fact, this source is already present in the article. -DePiep (talk) 19:12, 5 September 2021 (UTC)[reply]

It's because ¹⁴²Nd is 27.152(40)% which was rounded to 27.2%. Double sharp (talk) 14:02, 30 December 2023 (UTC)[reply]

References

^ "Standard atomic weights of 14 chemical elements revised". CIAAW. 2018-06-05.

Possible α decay of several isotopes of neodymium

According to [1], ¹⁴³Nd (N = 83), ¹⁴⁵Nd (N = 85) and ¹⁴⁶Nd (N = 86) should respectively have an α decay half-life at the order of 10⁸⁸ years, 10²² years and 10³⁴ years. Given the trend, ¹⁴⁷Nd (N = 87) may have an alpha decay partial half-life at the order of 10⁵² years. ¹⁴⁸Nd (N = 88) should have an α decay half-life at the order of 10⁷⁰ years. Note that alpha decay of ¹⁴⁶Nd would be non-ignorable (having significant branching ratio) compared to the theoretical half-life of double beta decay at the order of either 10²⁸ years given in [2], [3] or 10³³ years given in [4].

¹³⁹Nd (N = 79) and ¹⁴⁹Nd (N = 89) have respectively an alpha decay energy of 0.21 MeV and 0.29 MeV, which is quite low, so alpha decay may be possible but with a partial half-life long beyond imagination. 129.104.241.214 (talk) 09:43, 4 November 2023 (UTC) and Cristiano Toàn (talk) 02:41, 26 January 2024 (UTC)[reply]

Note that ¹⁴²Nd is much too stable

It is 1.6698 MeV lighter than the average mass of ¹³⁸Ce and ¹⁴⁶Sm. 14.52.231.91 (talk) 00:30, 16 August 2024 (UTC)[reply]

Neodymium-143

According to here, ¹⁴³Nd has indeed a very long half-life. Although ¹⁵⁵Gd and ¹⁶²Dy have longer alpha decay half-life among those nuclides stable to beta decay and double beta decay, perhaps their cluster decay half-lives are shorter (see here). For ¹⁴³Nd, its cluster decay should be negligable compared to alpha decay. 14.52.231.91 (talk) 01:14, 16 August 2024 (UTC)[reply]

Double beta decay of ¹⁴⁶Nd, quadruple beta of ¹⁵⁰Nd

Neither 2β^- of ¹⁴⁶Nd nor 4β^- of ¹⁵⁰Nd is observed, and both processes are predicted to have very long half-lives (>10²⁸ years for the former one and >10⁴¹ years for the latter one). But since the decay products are short-lived alpha emitters ¹⁴⁶Sm and ¹⁵⁰Gd, lower limits of such processes can be established, and that's what makes these processes interesting. See here (2β^- of ¹⁴⁶Nd) and here (4β^- of ¹⁵⁰Nd) for detailed discussions. 129.104.241.224 (talk) 16:37, 2 December 2024 (UTC)[reply]

Very cool! :D Double sharp (talk) 08:06, 3 December 2024 (UTC)[reply]

[CIAAW2017-1] "Standard atomic weights of 14 chemical elements revised". CIAAW. 2018-06-05.

[1]